I used to use a UB1 years ago when I had my rediculous rig, the kind I thought looked cool dragging into a pub as a noob.
It was four home made matching cabinets, a 2x15 on the bottom, then one housing a Line6 guitar combo, then a 4x12, topped off with a rack unit housing a Peavey Max valve pre-amp with crossover which split the high and low bass signal and fed into a stereo power amp via a stereo 30 channel graphic EQ.
I went through the UB1 and sent the octave up plus a 5th to the guitar amp and the clean bass to the Peavey crossover. Upped the gain to get a little valve growl and sent the highs to the 4x12 and the lows to the 2x15, did I pioneer 'tri-amped'?
When balanced properly, in more ways than one, I used to be able to create thunder with that thing.
Insane and slightly embarrassing looking back. πππ